A sauna can be used as a steam boiler, then being plausibly lethal:https://en.m.wikipedia.org/wiki/World_Sauna_Championships#2010_incident https://en.m.wikipedi

A sauna can be used as a steam boiler, then being plausibly lethal:https://en.m.wikipedia.org/wiki/World_Sauna_Championships#2010_incident https://en.m.wikipedia.org/wiki/World_Sauna_Championships#20... I usually spend like an hour at 75 degrees celsius with some moisture. Which is totally non-lethal.